Starting sequence system for telegraphs



Nov. 16, 194,3.V R. E. zENNER 2,334,234

STARTING SEQUENCE SYSTEM FOR TELEGRAPHS Filed Dec. 4 Sheets-Sheet l FIG.1

INVENTOR. R'AY M OND E ZENNER NOV. 16, 1943. R E ZENNER 2,334,234

STARTING SEQUENCE SYSTEM FOR TELEGRAPHS www? l' INVENTOR.

78 -RAYMOND E. ZENNER Nov. 16, 1943. E R. E. zENNl-:R

2,334,234 STARTING SEQUENCE SYSTEM FOR TELEGRAPHS 4 Sheets-Sheet 5 Filed Deo. 25. 1940 INVENTOR. RAYMOND E. ZENNER ORNEY.

Nov. 16,41943.

R. E. z ENNR STARTING SEQUENCE SYSTEM FOR TELEGRAPHS Filed Dec'. 23,

1940 4 sheets-sheet 4 1w' INVENTOR. RAYMQND E. ZENNER ITB WIM Y/fl MMI. VMM

ISI .Sl x bl 4 ATTORNEY.

Patented Nov. 16, 1943 STARTING SEQUENCE SYSTEM FOR TELEGRAPHS Raymond E. Zenner, Brookfield, Ill., assignorto` Teletype Corporation, Chicago, lll., a corpora-` tion of Delaware Application December 23, 1940; serial n9371358 `ze claims. t(o1. "iis- 4.1)

The present invention relates generally to telegraph transmitters and receivers and more particularly to telegraph transmitters and receivers adapted to facsimile telegraph systems.

In telegraph systems involving apparatus for recording characters by a series of velemental areas of positive and negative surfaces, each letter symbol or character is scanned or analyzed into a succession of constituent areas, and a transmitting element representative of each letter symbol or character is constructed in accordance with such analysis. Electrical impulses accordingly are generated tocontrol and to operate a receiving printer of the type generally disclosed,A

in Patent No. 2,131,741, granted October 4, 1938, to E. E. Kleinschmidt et all, to form the characters line by line.

An object of the invention is the provision of a 4 transmitter operativeirom a control strip to assure the operation of its associated receiver prior to transmission of signal impulsessrepresentative of characters, letters, or symbols.

Another object ofthe invention is the provision of `a transmitter operative under control 'ofa control tape equipped to preclude advancement of- Y the tapeuntil the lapse of a predetermined time interval.

A feature of the invention resides inthe provision in a transmitter, arranged with a plurality of transmitting elements, one foreach character,

` letter, or symbol, which are rendered effective vby a control tape, of electrical contacts operated in succession'for establishing receiver motor control conditions and tapecontrolconditions to condition the receiver for operation and `to start thev tape for control of the transmitting elements.

The above and other objects of the invention are achieved through the provision of a mechanism for sensing perforations in a tape perforated .in accordance with a five-unit or Baudot code which, through its electrical contacts, controls the energization of a plurality of electromagnets, one individual to each element of the permutation code. These electromagnets serve to control the selective position of permutationbars, which accordingly will be set in varying combinations in accordance with the code combinations of perforations appearing' in the perforated tape. The permutation bars for each permuted setting serve to select a pair of brushes. pair ofthe brushes is apair of/oode discs designed in accordance with a method of prescanningy in which the characters or symbols to be transmitted are divided into any desirable number of sending units or areas. The several unit areas thusr Individual to each created 'are assigned in the order 4of scanning to 'the periphery of a code disc.

Specifically, the two discs constituting a pairH of Ycode discsare allocated to'letters and figures,

orlower and upper case characters, respectively. With the selection and cooperation of a pair of brushes"` with a pair of code discs it is necessary -to 'select between the pair of code discs. -Tofac- Ycomplish suchva result, mechanism isrv responsive to `shift and unshift signals appearing in the perforated tape to select between a' pair of collector rings, one identified with the shift'signal and the other identified with the `unshift signal. Under such circumstances one disc of each `of the pairs of discs will be connected to one of the collector rings ;`V whereas'the other. disc of each ofthe pairs `of discs will be connected to another collector ring, land by selecting between the collector rings inv accordance with the shift and unshift signal combinations, the impulses indicative of the `character to be transmitted canbe selectively determined. l l

`The code discs are rotated continuously by power communicated thereto from a continuously i rotating motor, and since' the brushes are selectively operated in accordance with the permuted y rsetting of the permutation bars, impulses representative of the positive and'negative' surfaces of Athe character willfbe transmitted. VThese impulses will be effectiveat' the receiving station to record a character in accordance with the pattern of thecharacter formed on the periphery of the code disc then eiective for thetransmission, of

' the characteristic impulses." o Y H v .The Vcode discs rotate continuously, and the permutation bars `arefsetipermutably in response to the energizationof electromagnets, as previv-ously`outlined. 5 Energization of thev electromagnets is under the control of a tape sensing mechanisrn'which receives' its operating impulse from acam operated' in timed `relation with therota- `tion of the code discs. For each rotation of the discs and the indicated cam, an impulse is ,generated to effect the energization of an electromagnet of the tape sensing mechanism to Withdraw its tape sensing fingers and advance the tape to pre- Y sent 'thefnexttransverse row of perforations in alignment with the Vtape-sensing elements of the sensing mechanism. y Under predetermined conditions it is desired to arrest the operation of; the transmitteror the tape sensing mechanism, and therefore ,mechanism under the control of the condition of the perforated tape is provided wherebythe impulse generated cyclically through :the operation of the cam will, not be, effectwe to V tively. v

In addition to code disc I3 andcollector rings I5 and I6 there are secured to shaft 9 other discs which serve, through their cooperation with brushesl individual thereto, to .transmit a start `signal at the beginning of each resumptionv oi message transmission, as will be explained hereinafter. l

In the operation of the transmitter constituting the present invention certain functional operations are required. VSuch functional operations are performed by cams 24,25,- 26; andv 21 secured to shaft 9. These cams are positioned on shaft 9 with respect'to each other and with respect to code discs I3 to performtheir respective functions in timed relationwth the other functional responses and the transmission of signal impulses as determined throughl the rotation of code discs I3. It is obvious,` therefore, that the cams 24, 25, 26, and. 21 maybe oriented on shaft 9 with respect to each other to provide proper sequential operation in a manner fully contemplated by the present invention. A

Positioned with respect to shaft 9 and thecode discs I3 are a pluralityof permutation bars 3|, 32, 33, 34, and 35, one individual` toreach element of the code, According to the embodiment of the invention disclosed in the aforementioned drawings, a five-unit code is employed, `and therefore there are five permutation barsor one individual to each element orV unit ofthe code. Operation of the permutation bars is attained through the arrangement-of an electromagnet individual to each of the bars-Undersuch 4circumstances there are five electromagnets` 31, 38, 39, 45, and 4I. neseelectromagnets are selectively controlled from a tapesensing mechanism 43 and control, throughtheir armature, a springheid latch 44 which engages a shoulder formed on the upper edge of its permutation bar to hold it against `the action of its individual spring `(not shown). Under such circumstances, when an electromagnet is energized thev spring restored latch 44 is operated to move its end free ,of the projection on the upper edge of its permutation bar, whereupon such permutation bar is moved to .the left, as viewed in Fig. 2, by the action of its individual spring (not shown).

The tape sensing mechanism k53, as is fully and completely disclosed in PatentNo. 1,460,357 to E. E. Kleinschmidt of June 2.6, 1923, embodies a plurality of tape sensing fingers 41-which serve to sense perforations in tape 43, which has been perforated through the operationof a keyboard perforator or a signal controlled vreperforator to form transverse rows of code perforations indicative of the characters or symbols of the message to be transmitted through the effectiveness of code discs I3. As is fully disclosed in the aforementioned Kleinsohmidt Patent'No. 1,460,357, the sensing fingers 41 are pivoted on a rod`49 and are movable about such rod by an electromagnet 5B. Specifically, electromagnet 5I), upon being energized, draws its magnetic yoke 5I to shift its cores axially to push a non-magnetic pivotedbail plate 52 against the five tape sensing fingers 41 and thus withdraw the sensing fingers 41 from engagement with the perforations in tape 48 and causes, following such withdrawal, the advancementof the tape through a ratchet and pawl mechanism (not shown) to present the 4next transverse row of perforations in alignment with the projectingA ends of the sensing fingers 41. The magnet core of electromagnet 5U is,of course, so designed as to respond in well-known manner to the energization of said magnet, and said core is provided with non-magnetic extensions which engage the bail 52. f

Attached to and operated by each of the sensing fingers 41 is a contact spring 54. There being five sensing fingers 41, there are iive contact springs 54 which cooperate with stationary contacts 55 tov eiecta circuit closure and cause, through` the instrumentality of a battery, the energization of theV electromagnet connected thereto; namely, to cause the energization ofthe respective electromagnets 31-4I. c 'i Assume, for example, that a sensing finger 41 encounters a perforation `in tape 48;" Through its contact spring 54 an energizing circuit for the electromagnets 31-4! connected thereto will be established, The electromagnet will be energized vand latch `44 will be operated against the action of its spring to free the permutation bar individual theretoY for action by its spring (not shown) Such permutation bar will be moved to the left, as viewed in Fig. 2.

Under certain conditions of operation it is desirable to prevent the operation of the tape sensing iin-gers 41, vnotwithstanding the fact that the lelectromagnet 50 may be energized cyolically.

In order to achieve such a result, an electromag-- net 51 having an armature 58 -is provided. Throughbail plate'52 electromagnet 51 locks the armature of electromagnet A50, so`that notwithstanding thefact that the electromagnet Eilis energized cyclically, itl will have no functional response on the sensing ngers 41, its cores merely engaging bail plate 52, which is attached rigidly to the armature 58 of electromagnet 51.

As shown in Figs. 1 and 2, the lo'w'er edge of each of the permutation bars 3I--35 is formed with aplurality of notches arranged permutably `so that 'upon the permuted operation of electromagnets 31-4I, corresponding operation of permutation bars 3I-'35 will result in the alignment ofthe notches to 'effect the selection of one of aplurality of selectable bars 6I.` There is a selectable or selecting. bar 6I individual to each pair of code discs I3. Each selectablebar 5I is individual to a brush carrier or support 53 i (Fig, 1) carrying a pair of brushes 'and `Ii for each pair of code discs I3.

Each of the brush supports 63 has formed on one of its arms a horizontal projection E1 which liesin the path of its individual selectable bar BI, so that uponvthe operation of its bar 6I brush support 63 will be rotated in a clockwise direction about rod 64, as viewed in Fig. 1, against the action of its retractile spring 68, provided, however, the brush support 63 is at that instant free to move. support 63 has a horizontal extension 69 arranged with its end formed in a knife-like fash- As shown in Fig. 1, the brush leral formation.- v

scrilzied;l ismounted on shafti 9. For-each operation of c amll.A bail lwill have its knife-shaped portion-rnoved free of the.l correspondingly shaped projectionf 69 of' the; brush carrier 63 to release` the brush carrier 63, whereupon it is restored to itsr normal position, or the positionrshovvnin Fig. 1; by the-'action `of its individual retractile spring, |58.` v

Common to all selectable members 6| is. a bail 80 Which is' pivotally mounted on rod Gland which has vertically projecting arms, 45 and 46 to .which cam rollers operatively positioned with respect tocamsivv and 26 are secured. vRetractile springs 59t and'. 60 aresecured to arms 455 and 46 of bail 8D, respectively. Foreach rotation of cams *25,v and 26 bail''v will be rotated counterclockwise, as viewed inFig. l, against the tension of springs 59' and 60; to move the selectable bars 6| freefofthe permutation bars'3l1 and topermit their operation, and subsequently will'releasethe selectable barsv 6| to permit one of' such. bars .to be; selected through the alignment of a set of notchesr in permutation bars Whenthe.- permutation' bars `3`|35 are posi tionedf in various combinations in response4 to the permuted energization of electromagnets. 3ft-4|, a1selectable bar y6| Willi bef rotated'fabout rod e4 by its spring 62 to engage projection El of kbrush carrier t3,v since at` this instant-bail. 'Hi is free of extension 69, ofpitstbrush carrier 6,3; The brushv support 63 individual to the operated selectable bar Btwill be. moved against; the action of itsspring-GBjto bring the brushes- 65; and Gt into.y operative; relation with respect toA the pair otcodeediscs-il towhich the operated' brush support 6:3: is individual. Following the; setting, of the brush support [i3-locking baill 'lil is restored byits spring 111|v to aposition1where it, engages extension 68 ci brush support 6-3gand holds rsuch brush supporti-nits setv position. Thevselectable memberl 6| is thereupon free' to be restoredto its normal position out on cooperation'v with the permutation bars '3L-35 through the action; of bail 8|),l andi thusv the:4 permutation bars-maybe reset to select eithenthe same selectable bar 6| or another selectable bar 6| identifledzfwithra pair ofcode discs |35. With such` anyarrangement it is possible-toinitiatea, selection during thel interval the brushes65 and arefinizengagement with the code discsl `|3 for the transmission of signal impulses characteristicof; their periph- Following the selection of aselectable bar 6| and the operation ot the brush; support 63,. a cam (not shown) mounted on shaft iseffective to. operatev through' a; systemof levers, as fully disclosed in Patent No. 2,176,740. to EL E; Kleinschmidt of Octoberl', 1939,l to restore each of the released permutation bars 3|-35f to their normal position, or the position shown in Fig. 2, wherein the bars arerheld against the action of their individual springs by latches 424; f

As previously describeCLa .code disc |3 of each pair of code discs isconnected* to collector-rings I5A and I6; respectively. Continuously in engagementwith-- each of thesev ringsv are brushes 82 and 83, respectively (Fig. 2). These brushes are connectedthrough electrical.. conductors to contacts 8,4 andblf Cooperating with these contacts is a contacter Bvpivoted at one end'and engaged'atgitsiother endwith arockable member 8l. Secured to member 81' are-twooppositely'ar.- ranged; bell?. crankzlevers 88@ and 89'k arranged to move; member; 811-: to.y the right or left, depending tact ,8.4 or contact 85;.

upon ,whether'bell cranklever 88 or bell crank lever 89S` is operated, to;- causel corresponding movement ofcontactor;86-to engage either con-f Operation of bell crank` levers 88 yand 89 is achieved through selector bars individual thereto. As shown in Fig. 2', selectable bar 9|)` is individual to bell crank lever 88 While selectable bar 9| is' Upon the se-v individualy tos belli crankil'ever 89. lection andaoperation of either of the selectable bars 9D' and 91| the bell'vcranlrv lever 88 or 89 individual theretowillbe operated and corresponding movement.l of member 81 will be effected. TheL selection. and operation of the selectable bars A9!) and 9|, which are identified with figures and letters or shift and unshift signal combinations, respectively, are selected and 'operated' through. the setting of the permutation'bars 3|35L inn responseV to the energization of the cause engagement of contactor 83 with contact 85. Inasmuch asl contactor 86- was previously in engagement withfcontactv 845 and since contacts 841andf 85- are connected electrically to collector rings' |`5i and I6; respectively, thel circuit will be changed from collector ring l5 yto collector ring I6; 'Correspondingly selectable bar 9| may be operated in response to a lettersfI code combination in' tape'f48' to cause the member 8 1 tomove contactor lBt' from engagement with contact 85 into engagement'with contact 84;

Inasmuch as aY code disc of each pair of code discsl'3 isconnected either to collector ring I5 orvcollector ring |6'and since the circuit from the collectorV rings 5 and I6. is determined bythe position ofcontactor 881, the effective; circuit will dependupon the position of contacter 8S which,

as shown inl Fig; 2, is connected to a radio freknown design.

Positioned near-.the entrance end of the tape sensing` mechanism 43"is .a mechanism commonly referred to as a taut tape switching, mechanism Which responds to the conditionof ,the tape to ex-j.

ercise, control' functions. Sucha mechanism, as exemplified in. Fig.` 2,. embodies a, bracket to which Va lever 93'is pivotally mounted ona shoul- 'der screw.94.v Apinl 95 is also. mounted in this bracketand serves.. to limity the clockwise rotationof lever. 93.. One armof leverliV extends transverselyl of tapev 48. and.- is. arranged -to be engaged by the tape ifl and when it becomes taut between the tape sensing mechanism-and the'perforator which functions to supply the perforated tape:- 'IYhef othervarm of'lever 93- extends vertically andfis. positioned such that its free endr` magnet |03 to ground:` Ofzcoursawith sWitchSS i open, .the circuit for electrornagnetV |03 Willnot be completed;A also, with contacts 96 fand91 open Electromagnet 51,'on becoming energized, willand with switch V99 closed,the circuit of felectromagnet |03 will not be completed' ,JI-IoweverQfwith the lever 93 in the position shown in Fig. 2,1which is its position wheny the tape 48 is loopedl as shown, contacts 90 and 91 will beclosed-ffand with switch 99 closed electromagnet|03 iwillbeenergizedu` f As disclosed in Figpl, electromagnetw-I3has its armature E04 pivotallylmountedinJalbracket |05 and held in its released position "by a spring |06. Pvotally attached to arm'ature"|04v is 4a vertically extending lever |01Hwhch isfr'nove'd to the position shownin ygrl lby'a spring |08 which has oneend secured tof'arm' |01 'and the other endsecured to a xedspringpostg- Secured" near the vfree end offarm |01 isi fa-f pin-i or worm hold the bail 52 in its counterclockwise position to hold the sensingngers 41zin theirretracted position and preclude temporarily the sensing of thenext transverse row of code perforations in tape 48; It is, ofcourse, understood that during such period shaft 9 rotates continuously; how- 1 ever,no signals will be transmitted through the follower |09 "which, when electromagnet 1|03fi`si energized, engages thefthreads of worm which as disclosed in Fig.l1isfcrmec inmfthe-ieft'A-napc The upper end of arm--| disclosed -1n Fig l, is beveled and, is arranged ringfitslmoverrleht from right to 1eft, asviewed Fig wlenelectromagnet iii isenergize will be inengagement-with thread'of-'wrm 30 to operate successively'f'contacts-||2 and H3. The contacts Y |2 andi i3," asf-'willf'jbe' described hereinafter, functionr4 to; generate `jsi'gnal `condi-` tions Which will cause'operation 4 of the'fradio transmitter 18 `to transmit tothe "radio receiver 19 a signal effective toI control the `operating circuit ofthe driving mo-tor ofthe receiving printer which is connected to the/radio? receiver network' 19. Positioned beyond the left=handendofshaft in its extreme left-hand positionf'in,whichposij As disclosed in Figs. l and@ contacts -|l|^`fj4 `fare normally open. Thesefcontactsifas disclosed' inl Fig. 2, control the energizingfircuit'oi .relayiljl AIii in cooperation Awithcontacts 6 Whichjareiidenfjtied as the 'pulsing contact'svandj Which arewoper ated cyclically'by` carn2j '1"rnounted shaft'; For each rotation-'of can1 21 contacts 1|| 6 are closed tocontrol, depe ing" uponfvvhether con.-` tacts Htlare'closedgt f and to close invariably, the"energizirig circuit. of electromagnet of the tape"y sensing mechanism 43. `Also cooperating Withjgrelay |5I8 land' LoonL trolled by pulsing contacts H isla With electromagnet lt'd 'energia will be rotated by the actie ysr'iririg |08 to the position shown in Fig. 1 whichioperation'occurs either upon the opening of switch 30 or the openTf ing of contacts 9G rand 91 in response to the tape E 4becoming taut and rotating lever 93" n Ya counterclockwise direction' 'about fits pivot 04'.l The de -energization or electromagnet; 03`firi`this manner, permits the movement of'lever iIIJ-fllloy its spring 08,:awayfromthe Contact 4`, thereby breaking the circuit formagnetj |8`. cThe locking coils 51 are not energized "irrimediatelyiupgnfthe release of relay i l8r. "The v'release o frela i 8 prepares a path fora circuit Athrough coils 4iil'so that upon thenextclosure of 1con"tacts= relay 'H1 Will* Operai@ and lmfplcte'.thecirfzu ,beginning at grounded battery'throughl th'ejbaclg lcon-1 tact of relay-'l i8jthroughjtl'ie contact of relayhlli 1 just closed, through thevright-handfwinding of tion it will be movedby c operatigjn'jof ffollower ra'dio transmitter 18 because there are no brushes 65 and BBin engagement with code discs I3.

- Assume, for; example, that switchSS Was closed and that tape i8` b'ecame taut to operate lever 93 and open contacts 96 and ,191.` Electromagnet |03 would thereupon become .de-energized `and arm |01 would be restored immediately bythe action ofxspring |08 to its 'extrmeright-hand position, or the positionrshow'ninFig. I. When the tape 48` becomes slack, or aloop is formedxinthat portion 4between the Aperforator `and fthe tape f sensingimechanism; lever `93 willvbe released and the tension of `Contact springpg will .restore it -to the position-shawn in `Fig'. 2. i Accordingly,icon tacts 96 andi$|1V will beclosed andan `energizing circuit forcelectromagnetv|03 will be completed t. extending from ground at battery through contacts-061 and 91,1closed contacts of switchfand the;` winding of 1 electromagnet 1| 03 fto ground;

Armature |04 of electromagnet |03 will `be `attractedyagainst ithejtension of its` spring |06, and

s arm V| 0"|`wi1lcbe moved to a position where its follower |109 engages the threadfin vvornr'30.; Due

to thel tfactV :that Worm i 30 ','rotates continuously,

the-1 followerrwith its; arm '|01.1wil1be movedito theleft in Vthe direction ofthe 'a'.rr,oW"shoWn/inV Eig. 3; Asarm,|01 travelsgfrom,its` right-hand to rits,l left-hand. position;v contactsA :l I2 and |73 will be closed, successively; itorg'enerate in radio transmitter 18 two mpill'sesain': succession for transmittingv signals corresponding Ythereto to the radio receiver 1 9 forgeiectingccontrcl fof I the receivingmrinter, as Wil1 .be described hereinafter.

1 AFollovver .|051L continues vinftengagement Withv thecthread lof t wormgountil' :'it reaches the. end thereof; l,wherraitgfalls ffree of. the Worm; Whereupongit closescontacts` ,||A4. i. Upon: the Y closure of,contacts ||41;.an-: energizing Vcircuitifor relay pulsingfcontacts; |I|6 through camfZl the energiZing circuit ofrel'ay A| |18 is completed, Whereupon -the energizing circuit;forlfelectromagnet 51 andrlelay 1| I1 is opened; E1ectromagnetf51 and relay V| |11 thereupon [are de-'energized Upon the lopeningjof contact ||6 electromagnet 50 will become :de-energized and the tape sensing "fingersf willbemovedlto-a pos'ition"to"sense the then aligned transverse .row of perforations o, in tape 148 "and 'eiect'," :through i contacts T54", the transmissionof a,.correspon'ding signal to electromagnets `.t1-'41| fto se't ocorrespondingly 'the permutation bars13|-'35. `Through the setting of. the s permutation bars 3 |35 a `selectable-bar 6| twill `be selected `(and va l brush 'support "8f3 "will beoperatedi to effect transmission through' the cooperationio'f brushes 05 and 566 withdiscs I3 to transmitv a"grou'p of signals determined by thefperipher'al"contour"of the `selected discfof the `pair of Adiscs |359 The" operation will be continued through! v the `'succz'es'sive yp'ernuted setting of the permutationnbars 3|"-`35`. `:jFr each rotation of" AShaft '9; vcarri 2 WillV closeeotacts IIS ahd'willestablish an energiziri'gcircuit for relay 'I-lowever, sincer contats" ||l|` areclosed, relay ||8 jvvillfbe` energized simultaneously"with relay '|1`.- -The circuit" toA lockngunagnets' 51 is not closed'becaus'e relays |-1` and 'lll 8"are' operated :.simultaneouslyleach itime that :contacts Illare closed. v'.'Ihf'are'foregpeach :time the cen-- tacts oaf/relay.' I |11 c1ose,..the. contactsL ofrrelay3| t8 openiandcaxcirouit.- cannotf lee-:completed through both. of .these :contactssto energize .looking-anagnet 1. :Such operation continues.: .until l switch 99 -.or contacts .iiand 3&1 are opened.

AUpon .the opening of contacts 1.96 :.and'a1 .in response :toV a taut tape :condition :through ithc operation. of .i lever 53, :the eenergizing circuit :for

` electromagnet L|33".will:b.e .openedri and .itsarmature. .f I 04 will/be Amoved `to its' retracted :position by. spring H16, :wherein tthe :follower 10.9 '.-will :be free ofathewormi. Byithe actioniofwspring'ili arm I;1..and;..its :.iollowerl |19 uwilllioeamoved l.from left;to vright,vz-as.indicated:by .the lower 'arrow in .3. ArmV |01 remains. in: thiszpositionmntil electromagnet'ilS'. isiagiain energized innresponse to thezclosure lof.;.cr; r`1tacts 95 and `S91. iWhen these .contacts ,f are fclose'd, .felectromagnet..` w3 iis re-energized and rarml. L01. engages morml: and is .moved from )its .rightehand .fito its'leftl'hand position '..for ,closing :in .succession :contacts z I1 t2, |13, and -iI I4 for achieving '.:the fiunctions :previously described. v

disclosed in 22,;the :radio i reoeivingfnetworkin, which mayohezoi;awdesigmandwonstruotionto receive the;.signais;igeneratedtthroughlthe operation .of I:the radio frequency :transmitter 18, functions ltoamplifmsshape, andfdeliver :signals of, properfamplitude 'andshapeftottherfprintinggtelegraph receiver tv'vhichf is shown: diagrammatically in'. Eig; 2' by .the rectangle'll Lthatis,

'the .signals @delivered by the "output fcircuit :of

theradio: receivingnetwork i1 aarer oi'zsuch amplitude and .shape as V.ato operate '.efiicientlyf the xreceiving printer indicated idiagrammatically Aby the reference^.=numera1;8|." .The receivingzprintermhichiis electr-ically-foon necte,d:to:the1radiaoreoeiving;network.involves y continuously shy aimotor 't21. ZIheeprinting knife=edgezorzplaten 25 functionstorcausetthe paperstrip |32, togethers-WithLits.t carbon spaper, to be moved f into :cooperation Lwithathe aifluted printing wheel lagtoeeiectzprintingginaresponse to ,thelselectiveeoperation of the--selectorimeans as 4.evidenced .by theL'energization oof Athe :electromagnetic ...coils |529 and .t30. '.-The imotor |21 drivesthe `fiutediprinting rwheel 3h26; through ia gear.y I 34,.esecuredi..totthershaftiiof theimotonfand a, gear 1,. I securedatot vvshaftr M36 Ywhich carries the iiutedgprintingiwheel1|2I. :Also mounted on shaft |36v A is. a :worm gear .L38 #which fis mashed with a l:gear |39.mounted-ionioncgend .ofaa:.shait I 4 0 ,which alsocarriesffa wolmiigear s M Worm gear |.4 I ,is .meshed .with-fainiongggear I4.2,.-;se cured.: to vshaft L43 on which. is.mounted-., a; ."worm f |44. With the .motor- |.21 rotating-continuously,

iiuted printing wheel |26, -shafts and |43, and .worm |44. falso .rotate i continuously. 1

A Cooperating .with .wor-m ;|44;is sa -follower .pin I 45 mounted in. .the free yend .0L an..ar.m: 141 .at-V

tachedto varmature .5 |148 :ofan velectrornagnet |49. Asspring 1h50 has fone nend attached .atofzarm .1I 41 and its.:othe`r1end;attached-to aixed .spring.post,

noti-shown; :and ...functions .to retain arm .r I 41 .fin'` its counterclockwise yrposition, :or the position op posite:tozthat;shown in Fig..i4. .'Aspring .I5I is attachedzto zarmaturexIAB Aand. serves lto restore the z armature .to rits 5de-energized .position yupon cie-energizationfofzelectromagnet |49. -With .regardfto; arm:` |1415 it is. tsignicant to notezthat itis mounted omarmature :M8-in: a. manner which permits its 4-reoiprocation `from .its counterclockwise ,position 'to the positionfshownin Fig. 4, through :cooperation of follower. |45 with vWorm |44, .ztoengagean-insulated block onthe .lower endl of:.-acontactspring |52which cooperates with a-contactfspring |53 .to .controlthe operating circuit offvmotorfIZ'I.; that-is, whenspringcontaots I 52 and .|531 are: in-:engagement (when -arm |41 -.assumes itscounterclockwise position). the circuit for motor |21 is completed,'whereupon lutedprintingfwheel :I 2li-and shafts t I 49 and I'43 willrotatecontinuously.

.Positionedi below .armature z I 3 I of the electromagnetic, .unit |24 .andtcarried `on extension -I I5 thereoffis fanielectrical contact- |55 y.which is 'connected'to a;grounded.Joattery,and.which cooperates with a.contact.|56 .mountedonftheunden sideof armaturefll, asshown clearly in.Fig...4. ContactfzISB.is-.connected through a, reactance coil. |51 to i the .windings of. .electromagnet` |49.

Normally, 4.the Aarmature A.of relay `IIII is vpositionedtoengage Contact4 |22.and complete--a circuit..from..battery, .through winding Y|3Il of the -electromagneticselecting unit 124, .so .that the armature .ISI .willberotatedabout its Ipivot in a Aclockwise direction, .Whereuponcontacts |55 andffISB' :will 4:be .in .engagement to establish an ,energizing circuit .for electromagnet |49.

. Through .the energization off-electromagnet |49,

and.the,rotationotarmature |48 iria clockwise direction, followerjimountedon arm |41 will be .moved to the `right .through V.its cooperation with .worm ,MLand WilLtravel ...tof its right-hand` position to.engage-thednsulatedblock on spring |52 and .separate contact A-.springs `|52 and .|53

and therebyQto ,open..the operating .circuit of drivinamotor [|21. .Duringithetime the armaturev;of re1ay |110 ,lisgin engagement with` contact,`

|22, .the Winding I 3.iof..the electromagnetic `unit .I 24 lisenergizediand rcontacts |55 .and |56 are maintainedclosedtto. comp1ete,'..a.ccor.ding1y, the energizing'circuitrofrelectromagnet |49 to hold the follower.L I4 5A inengagement. with the. worm I 44 andmaintain .contacts |52 Aand |53 `opened to maintainfthe v.power disconnected -.from motor |21. previously described, whencontactslwand 91. areclosed, assuming` thatl switchts 9` is closed, electromagnet 103i is Lenergized .andllower |09 engages ,worm3; .whereupon arm .|61 ,will .be rotatedA about its ,pivot'tongage,successively .con-

mets' n2 ,and 'l 1 3.' .Through disclosure omonf tact L I2, an; impulse lis .1 impressed on the radio Y transmitter L18 .whichtransmits asignal ,correspondingltheretoltosthe. radidreceiving ,network 19. .'.The actionof .thissignaLimpl'llse .on the radio Areceiving ,network .1,9 ,sis lsuch. as ,to i ,cause reversalof 4the armature.ofl relay. lum-whereupon its armature isy ,moved from fengagenent .with lContact |22 into engagement .with..con.tact |23.

Upon the..` engagement ofarmatur-e. of relay.y with. contact :|23`, :gan energizingffzcircuit is completedirom .batter-yt through the. winding I-29.of the-electromagnetic selectingnunitl24, and .the

mitter responsive to a starting condition to apply said control impulses to said channel, means at said receiver responsive to said control impulses for starting said motor, and timing meansat said transmitter effective following the `transmission of said control impulses to cause said transmitter automatically to transmit character signals over said channel. f

2. In a telegraph system, a transmitter having record strip reading means, a receiver, havingl a normally inert driving motor, responsiveto signals transmitted by said transmitter, a signal channel connecting said transmitter and receiver, timing means at said transmitter responsive to a starting condition to apply motor control impulses to said channel, means at said receiver responsive to said control impulses for starting said motor, means at said transmitter effective following the transmission of said control impulses to cause said transmitter automatically to transmit character signals, and means responsive to the tension of said record strip for discontinuing signal transmission from said transmitter.

3. In a telegraph system, a transmitter, a receiver having a motor, a signal channel connecting said transmitter and receiver, means for rendering said transmitter effective to transmit signal impulses over said channel for the supervisory control of said receiver motor, said means including timing means responsive to an electrical condition, and means controlled by said timing means and effective automatically after a predetermined period for causing said transmitter automatically to transmit receiver operating signals.

4. In a telegraph system, a transmitter, a receiver having a motor, a signal channel connecting said transmitter and receiver, means for rendering said transmitterY effective to transmit signal impulses over said channel for the supervisory control of said receiver motor, said means including a magnet responsive to an electrical condition, means controlled by said magnet and operative through a predetermined cycle, and means operated by said magnet controlled means for causing said transmitter automatically to transmit receiver operatingsignals.

5. In a telegraph system, atransmitter, a receiver having a motor, a signal channel connecting said transmitter and receiver, means forrendering said transmitter effective to transmit signal impulses over said channel for the supervisory control of said receiver motor, said means in-V cluding a magnet responsive to a local electrical condition, a continuouslyrotating Worm, an arm` movable byy said Worm, the cooperation of `said a motor, a signal channel connecting said transmitter and receiver, means comprising a pluralityi of pulsing contactsfor rendering said transmitter eiective to transmit control impulses over said channel for the supervisory control of said re`- ceiver motor, said means including means responsive to the condition of the record strip, and means controlled by said last-mentioned means for rendering said record strip reading means effective automatically to transmit receiver operating signals over said channel.

'7. In a telegraph system, a transmitter having a record strip reading means, a receiver-having a motor, `a signal channel connecting said transmitter and receiver, means comprising a plurality of pulsing contacts for rendering said transmitter effective to transmit control impulses over said channel for the supervisory control `of `said receiver motor, said means including means responsive to the condition of the record strip, and means controlled by said last-mentioned means Yfor rendering said record strip reading means effective totransmit character signal impulses over said channel.

8. In a telegraph system, a transmitter having a'record strip reading means,l an electromagnet in said record strip reading means for precluding operation of said record strip reading means, a receiver having a motor, a'signal channel connecting said transmitter and receiver, means for rendering said transmitter effective to transmit signal impulses over said channel for the supervisory control of said receiver motor, said means including means responsive to the condition of the record strip, and means controlled bysaid lastmentioned means for effecting the de-energization of the electromagnetin said record strip reading means for rendering, through said record reading means, said transmitter effective to transmit receiver operating signals over said channel.

i 9. In a telegraph system, a transmitter having a record strip reading means, a receiver having a motor, a signal channel connecting said transmitter and receiver, means forA rendering said transmittereffective to transmit signal impulses over said channel'for the supervisory control of said receiver motor, saidmeans including means responsive to the condition of the record strip, pulsing means operated cyclically for controlling the step-by-step advancement of said strip, and

timing means controlled bythe means responsive ,to the condition of said record strip for rendering of therecord strip, a continuously rotating vvorm,`

anarm moved by said worm; the cooperation oi saidarm with said worm being controlled by said magnet, pulsing means for controllingthe step;

by-step advancement of the record strip, and

means Voperated by said armwhen it attains a predetermined-position for renderingsaid vpulsing means effective to transmit Vreceiver operating signals over said signal channel to said receiver.

11. In a telegraph system, avtransmittena receiver, having a normallyinert driving motor, responsive to signals transmitted by said transmitter, a signal channel connecting said transmitter and l receiver, screw and follower means in said transmitter responsive toa starting condition to apply during the travel of said follower along said screw a starting impulse to said channel, means at said receiver responsive to said starting impulse for starting said motor, and means at said transmitter effective at the end of said travel to cause said transmitter automatically to transmit char" acter signals.`

12.` In a telegraph system, a` transmitter, a receiver, having a normally inert driving motor,

Aresponsive to signals transmitted ,by-said 'transmitter, asignal channel .connecting said 'transmitter 'and receiver, `rtiming means :in .said transxmitter responsive :to astarting 'conditionfto apply during .a `predetermined 'periodo'f actuation fof said timing :means a Vstarting impulse to :said channel, :means 'at .said receiver ,responsive to said starting .f impulse vfor starting-:said motor, :and means *at said transmitter effective :lat :the end 'of said .period of actuation to cause :said ltransmitter automatically to transmit character :signals. l

.113.' Infatelegraphrsystem, a'tran'smitterna receiverhavinganormally inert 'driving'moton 'control 'means ifor Vsaid :motor :responsive to signals transmittedv by 'said transmitter, a signal 'channel connecting said transmitter: and rreceiver, timing means'in saidtransmitter-responsiveto .a starting condition toapply during av predetermined period "of `actuation of said `timing .means a'startingzimpulse 'fto vsaid channel 'for operating said 4control means to :start 'said motor, and means at 'said transmitter .effective at therend lof said :period lof actuation-to cause saidtransmitter automatically to transmit character, signals.

1li nIn a telegraph system, a transmitter, a receiving printer 'having a normally linert driving motor, control means for said motor, .printing lmeans in said printer responsive to signals'transmitted by ysaid transmitter, contact means `associated with said printing means for. controlling Vthe operation'ofsaidlmotor control means, asignal channel :connecting said transmitter-and receiving printer, timing means in'said transmitter responsive rto astarting condition fto apply yduring a predeterminedperiod of actuation of rsaid "timing means fa startingiimp'ulse `to said channel for operating said Iprinting means to effect, through said contact means, the operation-of' said lmotor control means to start said motorfand :means at said transmitter Ieffective at the Yend of said period o'f ;actuation`to=cause said transmitter automatically Ito transmit character signals.

.'1'5. "In atelegraphsystem, a` transmitter, a receiver Vhaving la normally iinert Adrivin-g motor, control Em'eans for Ysaid motor, "signal controlled printingmeansin said Ireceiver, circuit controlling means `for said motor Ycontrol means'fassociated With saidprintinglmeans, signal responsive means in vsaid .receiver `effective under certainconditions I of operation'offsaidtransmitter to condition 'said printing means to renderA 'said motor controlmeans operable toistop fsaid motor, .said `signal 'responsive means veiliectivennder 'other conditions 'of operation 'of `said "transmitter 'to yc'onditior'i said printing :means to render said motor rcontrol means eiective to start said motor, and 'means 'in said transmitter effective lunder vfurther `conditions Vof operation ctofcause said A'transmitter automatically to 'transmitcharacter signals, Vfollowing 'the initiation of saidmotorinto operation. y

p16., In'v av printingV telegraph system, a `transmitter, 'a' receiver comprisingl a .normally inert driving motor, a rotatable v,printing element driven by said motor, a platen co-operahle .with said `element to effect printing, `a ,rockable varm for supporting said platen, a-polarized electro-k magnet for rocking -said arm, control .means for said motor, .and circuitcontrolling means forsaid motor controllmeans associated-With said rocker arm, .and .means responsive to predetermined marking and spacing impulse conditions trans mitted .by said transmitter K4for lcontrolling, through said electromagnet, the effectiveness of l17. In a printing telegraph system, a transtmitter, areceiver comprising a normally inert ldriving .,fmotor, a rotatable printing element driven by said motor, an instrumentality'co-op- -erable with said element to eiect printing, and

control means for said motor includinga member carried by said instrumentality, and Vmeans 'responsive to predetermined signaling Vconditions transmitted by Vsaid `,transmitter for controlling, through said member, said motor control means.

A1-8. In a printing telegraph system, a transmitter, areceiver comprising a normally inert driving motor,zcontrol means for'said motor, Aa rotatable printing-element driven by said motor, and an instrumentality co-operable With` said element to effect printing, said Ainstrun'lenta'lity carrying circuit :controlling .means for lsaid motor Control means, =andzmeans responsive to predetermined signalingconditions transmitted bysaid 'transmitter for determining, through said instrumentality., the effectiveness fof .said circuit controlling means to Y,govern said motor control means.

'19. 'In a printing telegraph system, a transmitter, 2a freceiver 'having a normally inert driving motor,-control means for said mo-tor, signal controlled printing means in said receiver, circuit controlling means for said motor control means -associated With said printing means, and signal responsive means in said receiver effective under certain conditions of operation of said transmittertocondition said printing means to render-said rmotor 'control means operable to stop said motor, saidsignal responsive means effective under yother conditions ofl operation of saidtransmitterl to condition saidprintingfmeans ,to render said motor control :means effective to start said motor. Y

2,0.` In aprin'ting telegraph system, atransmitter, 'a receiver comprising a normally inert' driving fiIIlO'tor,I a vrotatable ,printing elementldriven bysaid motor,.a platen, Va rocker arm for sup porting said platenppolarized means .for rocking said arm inaccordance with received signals, control means for said motor, circuit controlling means forsaidmotoi1 controlmeans associated With saidrock'er arm, and signal vresponsive means in saidreceiver .eiective under certain conditions of operation of vsa'idtransrnitter'tocondition said polarized means to .operate said rocker arm to render, through `said'circuit closing .means saidl motor'controlmeans operable to stop said-motor,

saidsignal .responsive means effective under .other conditions of'operation of said transmittertoconditionsa'idrocker arm to render said `motor .control means Aeffective to start said motor.

'21'. In av-,telegraph system, a transmitter Yhaving a record strip reading means, Aa Acam controlled fmeansin said transmitter for precluding operation 4of Asaid record .strip reading means, ay

operating signals over said channel, followingfthe initiation of said motor into operation.l

22. In Va telegraph system, va transmitter having a record strip reading/means, a cyclically actuated cam means in said transmitter for operating said record strip reading means, control instrumentalities cooperable with said cam means for precluding operation of said record strip reading means, a receiver having a motor, a signal channel connecting said transmitter and receiver,

means for rendering said transmitter effective to transmit signal impulses over said channel for the supervisory control of said receiver motor,

said means including means responsive to the 23. In a telegraph system, a transmitter having a record strip reading means, means in said transmitter for precluding operation of said record strip reading means, a receiver having a motor, a signal channel connecting said transmitter and receiver, means for rendering said transmitter effective to transmit signal impulses over said channel for the supervisory control of said receiver motor, said means including means responsive to the condition of the record strip, and means controlled by said last-mentioned means to establish a, condition for causing, through said record reading means, said transmitter automatically to transmit receiver operating signals over said channel, following the initiation of said motor into operation.

RAYMOND E. ZENNER. 

